Exhaust-muffler.



S. P. FABER.

EXHAUST MUFFLEH.

AgPucATloN FILED Amma. 1918.

Patented @21,1919

t erases .i

STEVE PETER FABER, F ORANGE CITY, IOWA.

" EXHAUST-MUFFLER.

Specicaton of Letters Patent.

resented aan. er, 1era.

Application filed August 19, 1918. Serial No. 250,619.A

To all whom t may concern:

Be it known that I, S'rEvE PETER FABER, a citizen of the United States,residing at @range City, in the county of Sioux and State of lowa, haveinvented certain new and useful lmprovements in Exhaust-Muftiers, ofwhich the following is a specilication, reference being had to theaccompanying drawings.

rlhis invention relates to an improved exhaust inuiiier, and has for itsprimary object to provide a simple and highly eiiective device orinuiHing or silencing the exhaust of internal combustion engines fsuchas are commonly used for the propulsion of motor vehicles.

't is another important object ot the invention to provide meansincombination with the rnuer at the outlet end thereof to accelerate thepassage or How ot the exhaust gases through the niuer.

lt is also a `further,general object ot my invention to provide ainuliler construction wherein the several parts are exceedingly strongin their construction and not liable to get out of order, and light inweight, While the' rnuliler as a whole may be constructed at relativelysmall cost.

y ing drawing in which similar reference characters designatecorresponding parts throughout the several views, and wherein:-

ligure l is a longitudinal section through an exhaust mufflerillustrating one embodinient ot my invention; and

2 is a section taken on the line 2 2 of Fig. l.

Referring in detail to the drawing, 5 designates the outer casing orshell ot the mui-lier, which is preferably constructed ci sheet rnetal,This shell is provided at one ot its ends with axially extending tube 6,said tube having a iaring or enlarged end .7 connected to the end `ivallot the shell. The other end ci this tube is coupled to the exhaust pipe8 ot the engine manifold and is equipped with the usual cut out valve 9.

vWithin the shell 5, a plurality ot cylinders 10 are concentricallyarranged in spaced relation to each other. 'lhe ends oit these as at 12,and extended to provide an outletpipe 13 through which the exhaust gasesare discharged to the atmosphere.

14 designates a suitable an case Within' which a multi-bladed fan 15-isrotatably mounted. The outlet neck 16 of the t'an casing is connected tothe discharge pipe orV tube 13 at a point adjacent the reduced portion12 of the cylinder 11.and in spaced relation thereto. Thefan is drivenby means of a suitabledrivingbelt, chain, or other operating connectionfrom the engine or motor.

The annular body walls of the several cylinders l0 are perforated, asindicated at 1T, so that the exhaust gases entering the shell or casing5 may pass through the openings .or pertorations in the cylinder wallsuntil they finally enter the inner cylinder l0. From the foregoingdescription, taken in connection with the accompanying drawing, theconstruction and manner ot operation of the device will be clearlyunderstood. the operation ot the engine, the exhaust gases from theengine cylinders enter through the pipe or tube 6 into the end orthe'muer shell 5 where they strike the end Wall 11 of the outermostcylinder 10. rhese walls 11 are preferably curved and serve to directthe exhaust gases into the space between the spaced cylinder walls sothat it will travel longitudinally toward the opposite end ot the shell5. The walls of the cylinders 10 serve as baiiies, the peritorations 17in the adjacent cylinder Walls being disposed in staggered relation. ofthe exhaust gases as they successively pass from one annular chamber tothe other is thus retarded or checked so that by the time these gasesenter the inner cylinder l0, the initial pressure of the exhaust hasbeen almost entirely overcome. provide the tan 15 tor the purpose otaccelerating the outflow of the gases from the inner cylinder 1G andthrough the discharge pipe or tube l. The air from the tan casing entersthe tube i3 in an angular direction and toward the outlet end thereol soThe velocity Accordingly, l'

that a vacuum is created behind this point of air inlet and between thefan case con: nection and the end of the muiiier. Thus, the exhaustgases will be positively drawn from the inner cylinder 10 and expelledthrough the tube 13 to the atmosphere. l

My improved muffler, as above described, while of very simpleconstruction, is at the same time eficient and reliable in practica-loperation. The arrangement of the concentric cylinders within themuffler shell serves to efiectually reduce the velocit-y of the exhaustgases and eliminatenoise' which would otherwise b-e incident to thedischarge of these gases to the atmosphere.V At the same tirne' lthelpossibility of back pressure y that the muffler may be made in anydesired diameter and length and a greater or less number of the spacedconcentric perforated cylinders may be provided than as hereinindicated. The several other parts of the device are likewisesusceptible of many niinor modifications and it is, accordingly, to

be understood that 'I reserve the privilege of adopting all'suchlegitimate changes as may be fairly embodied within the spirit and scopeof the invention as claimed.

The entire device will preferably 'be con structed of aluminum and isprimarily designed for use in connection with aviation engines, such asare generally employed upon army aeroplanes. As the improved muliierwill practically eliminate all noise from the enginei exhaust, theaviator may operate over enemy territory with less likelihood ofdetection. If desired, T may provide suitable spacing means between theseveral perforated cylinders of the muffler adjacent to their closedends.

Lacasse 1. A muffler comprising an outer imperforate shell having aninlet at one end for the exhaust gas, a plurality of concentricallydisposed cylinders arranged within said shell, said cylinders havingimperforate walls at one of their ends also spaced from each other, theopposite ends' of the cylin` ders being fixed to the other end wall ofthe shell, the annularbody wall of each cylinder being perforated andthe inner cylinder extending through the latter end wall of the shelland formed with a pipe extension through which the gases are exhaustedto the atmosphere.

2. A mufer comprising an outer imperforate shell having an inlet at oneend for the exhaust gas, a plurality of concentrically dis posed clinders arranged within said shell, said cy inders having walls at oneof their ends also spaced from each other, the opposite ends of thecylinders being fixed to the other end wall of the shell, the annularbodv wall of each cylinder being perforated and the inner cylinderextending through thel latter end wall of the shell and formed with apipe extension through which the gases are exhausted to the atmosphere,anda fan having a casing extension connected to the outlet pipe ,of theinner cylinder at a point in spaced relation to said shell to direct anair blast into said pipe and toward the outlet thereof, whereby aninduced suction is created in the inner cylinder to positively expel theexhaust gases therefrom to the atmosphere.

In testimony whereof T hereunto' aix mv signature in the presence of twowitnesses.

STEVE PETER FABER. Witnesses:

JOHN PoPrnMA,.Jr., EDWARD TE GRoo'rENHUIs.

